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By Ginny McCabe CINCINNATI (Reuters) - Police may bring criminal charges over a Cincinnati Zoo incident in which a gorilla was killed to rescue a 4-year-old boy who had fallen into its enclosure, a prosecutor said on Tuesday. The death of Harambe, a 450-pound (200-kg) gorilla, also prompted the animal rights group Stop Animal Exploitation Now to file a negligence complaint on Tuesday against the zoo with the U.S. Department of Agriculture. Online petitions at change.org drew more than 500,000 signatures demanding "Justice for Harambe." Cincinnati police are taking a second look at possible criminal charges in the incident after initially saying no one was charged.